Life Sciences Commons^™

The 14-3-3 (Ywha) Proteins In Signalling And Development Of The Fruit Fly, Drosophila Melanogaster, Santanu De

Biology Faculty Articles

The 14-3-3 (YWHA or Tyrosine 3-Monooxygenase/Tryptophan 5-Monooxygenase Activation proteins) are a family of highly conserved, homologous proteins critical to diverse cellular events including cell cycle, signal transduction and embryonic development. Various species-specific isoforms of 14-3-3 exist, encoded by separate genes. They are expressed in a wide variety of organisms ranging from plants to animals, including the fruit fly or Drosophila melanogaster. Drosophila is one of the most universally accepted model systems to study complex cellular mechanisms of signalling and development. However, regulation of these processes in fruit flies by the 14-3-3 proteins have not been entirely understood. This mini …

Ywha (14-3-3) Protein Isoforms And Their Interactions With Cdc25b Phosphatase In Mouse Oogenesis And Oocyte Maturation, Alaa A. Eisa, Santanu De, Ariana Detwiler, Eva Gilker, Alexander C. Ignatious, Srinivasan Vijayaraghavan, Douglas Kline

Biology Faculty Articles

Background

Immature mammalian oocytes are held arrested at prophase I of meiosis by an inhibitory phosphorylation of cyclin-dependent kinase 1 (CDK1). Release from this meiotic arrest and germinal vesicle breakdown is dependent on dephosphorylation of CDK1 by the protein, cell cycle division 25B (CDC25B). Evidence suggests that phosphorylated CDC25B is bound to YWHA (14-3-3) proteins in the cytoplasm of immature oocytes and is thus maintained in an inactive form. The importance of YWHA in meiosis demands additional studies.

Results

Messenger RNA for multiple isoforms of the YWHA protein family was detected in mouse oocytes and eggs. All seven mammalian YWHA …

Protein 14-3-3 (Ywha) Isoforms And Their Roles In Regulating Mouse Oocyte Maturation, Santanu De

Biology Faculty Books and Book Chapters

The 14-3-3 (YWHA) is a highly conserved, ubiquitously expressed protein family regulating important cellular processes including cell cycle. This work, for the first time, explored the differential expression and roles of 14-3-3 isoforms during mouse oocyte maturation.

All seven mammalian 14-3-3 isoforms were identified in mouse eggs and ovarian follicular cells including oocytes, by Western blotting. Immunocytochemical and immunohistochemical staining confirmed the presence of all 14-3-3 isoforms in oocytes, eggs and ovarian follicles with characteristic similarities and differences in their distributions.

Mammalian oocytes are arrested at meiosis prophase I by an inhibitory phosphorylation on Cyclin-Dependent Kinase I (CDK1), released by …